Innovation is at the heart of what we do, but it must be balanced with responsibility.

The essence of causal inference is to go beyond the data and ask what would happen if we intervene.

一个人越讲述他的故事，他就越成为他的故事。

在苦难时回忆幸福是最深的痛苦。

The will of the people, moreover, practically means the will of the most numerous or the most active part of the people; the majority, or those who succeed in making themselves accepted as the majority; the people, consequently may desire to oppress a part of their number; and precautions are as much needed against this as against any other abuse of power. The limitation, therefore, of the power of government over individuals loses none of its importance when the holders of power are regularly accountable to the community, that is, to the strongest party therein